What happens when a brain damaged Harry and a transgender Hermione both get sorted into Slytherin? Snape's not sure, but he thinks it's likely to be an interesting term. This story follows various first years through the trials of their first year.

When Professor McGonagall went to visit Harry Watson, son of Mr. Sherlock Holmes and Dr. Watson, to deliver his Hogwarts letter, she was in the mindset of performing a familiar if stressful annual routine. Consequently, she was unprepared to find the cause behind Harry Potter's disappearance. BBC Sherlock HP crossover AU

When Hagrid arrives at the Potter cottage in Godric's Hollow, he finds no sign of Harry Potter. It takes five long years for Harry to be found, in the care of a distant cousin, having been dropped off by his Great Grand Mother.